Single crane girder



y 1967 MISUMI OSAWA 3,319,802

SINGLE CRANE GIRDER Filed April 2, 1965 2 Sheets-Sheet 1 FIGQI INVENTOR.M ISUMI OS AWA ATTORNEYS y 1967 MISUMI OSAWA 3,319,802

SINGLE CRANE GIRDER Filed April 2, 1965 2 Sheets-Sheet 2 um .u.

FIG. 4

FIG. 5

PRIOR ART I N VEN TOR.

MISUMI OSAWA ATTORNEYS United States Patent 3,319,802 SINGLE CRANEGIRDER Misumi Osawa, Tokyo-t0, Japan, assignor to Ishikawajima-HarimaJukogyo Kabushiki Kaisha, Tokyo-to, Japan, a company of Japan Filed Apr.2, 1965, Ser. No. 445,134 Claims priority, application Japan, Oct. 22,1964 (utility model), 39/ 82,825 6 Claims. (Cl. 212-17) This inventionrelates to lifting cranes and more particularly to a single cranegirder.

Single crane girders of the conventional type are so constructed as toinclude the following elements, a trolley with a vertical wheel e andhorizontal wheels 7, g around the girder a, rails b, c, d, having beenlaid, respectively, for the upper vertical wheel e along the upper chordof the box-shaped girder a, for the upper horizontal wheel along anotherchord of the girder a, and for the lower wheel g along the lower chordof the girder a.

A single girder of the conventional type with the aforementionedconstruction, however, tends to be too heavy, because a platform for aelectricity-feeding apparatus must be provided independently, since theentire upper length 11 of the girder a cannot be used. This is a resultof a trolley astriding the width l of the girder a, and also because thegirder a must be made strong enough to bear torsional loading.

The present invention discloses a single girder, the upper surface ofwhich can be used effectively and whose weight is reduced. The girdercomprises a beam which can bear the horizontal wheel pressure from thedownward vertical wheel of the trolley, and also absorbs the horizontalwheel pressure from the lower horizontal wheel of the trolley. Thedownward vertical Wheel is located at the web of said girder.

The present invention will be more clearly understood from the followingdescription of specific embodiments of the invention together with theaccompanying drawings:

FIGS. 1-3 show preferred structures of single crane girders of thepresent invention. FIG. 4 shows the disposition of dashboards in asingle crane girder of the present invention. FIG. shows the structureof a single crane girder of the conventional type.

FIG. 1 shows an embodiment in which a beam 3 having an H-shapedcross-section is installed on the extension of web 2 of girder 1, whichhas a box-shaped cross-section. Vertical wheel 5 and upper horizontalwheel 6 of trolley 19 move along said beam 3.

FIG. 2 shows an embodiment in which a beam 4 having a cross-section ofbox-shape, one side of which is a portion of upper chord 7 of thegirder, is utilized. Vertical wheel 5 and upper horizontal wheel 6 movealong said beam 4. Slant brace 17 is disposed to bear possible torsionin the horizontal direction.

FIG. 3 shows an embodiment in which upper horizontal wheel 6 moves aboveupper chord 7 by having an extension of web 2 of girder 1 upward fromupper chord 7, and installing a piece of steel, member 8, for fixing arail for upper horizontal wheel 6 on the web-side end of upper chord 7.Vertical wheel 5 moves immediately above web 2 by installing a piece ofsteel member 9, to which is fixed rail 11. Upper horizontal wheel 6moves on rail 18 which is secured to steel member 8. The crosssection ofthe girder is a closed section, the inside of the girder 1 and theinside of the beam formed by the upper end of the web 2 and the steelmembers 8 and 9 being open to each other.

FIG. 4 shows a rail 12 for the lower horizontal wheel 13. Dashboard 14is installed in various places in order to make beams 3 and 4 lock witheach other. are located at both ends of the beam.

In the case of the single crane girder of the present invention, inwhich various rails are concentrated around web 2 of girder 1, the upperspace of girder 1 is used effectively by making the trolley smaller,thereby enabling the upper space to be used for a platform forelectricityfeeding apparatus. In the present invention, there is no needto provide an independent platform as in the case of the girder of theconventional type. Furthermore, lighter material can be used, as it ismade possible to decrease the strength of the structure for girder 1 ascompared with that of the girder of the conventional type, the torsionbeing borne by beams 3 or 4. A reduction of expense is also madepossible.

In the case of the single crane girder shown in FIG. 3, in which variousrails are concentrated on around web 2 of girder 1, the trolley can bemade smaller and the upper space of the girder can be effectively used.Furthermore, as the torsion can be borne by the beam formed by the upperpart of web 2 and steel members 8 and 9, the weight of the girder 1 canbe made lighter. These merits are present in the embodiments shown inFIG. 1 and FIG. 2. In addition, since the cross-section of the girder isa closed section, dashboard 14, being a single construction, can beinserted easily and precisely, and the shear stream can be calculatedvery easily. Rails 10 and 11 are easily affixed by welding or boltingeven after the girder has been built up.

In the case of the girder shown in FIGS. 1 and 2, the girder may be soconstructed as to bear torsion in vertical planes by welding dashboards14 on the upper chord 7 and beams 3 and 4, or by installing a slantbrace. While the embodiment shown in FIG. 3 does not illustrate a directstructural connection between chord 7 and web 2, a user of thisinvention is not precluded from adding such a connection in the form ofcutting and welding struts or gussets to said parts at a later time.

What I claim is:

1. A single crane girder for use with a trolley comprising: a girderhaving an upper and a lower chord; a beam supported by said girder anddisposed along a portion of the topmost portion thereof, said beamcomprising a plurality of members disposed above said upper chord, saidmembers forming at least one substantially horizontal bearing surfaceand at least one substantially vertical bearing surface, strengtheningmeans disposed above said upper chord and connecting said members; railmeans disposed on said bearing surfaces and on a lower portion of saidgirder forming means for sustaining pressure from the wheels of atrolley and that the width of said upper chord exceeds by a substantialamount the combined width of said beam, said horizontal bearing surfaceand the horizontally disposed wheel contacting said horizontal 'bearingsurface.

2. A single crane girder according to claim 1 wherein said beam issubstantially box-shaped.

3. A single crane girder according to claim 1 wherein said strengtheningmeans comprise a portion of a web of said girder.

4. A single crane girder according to claim 1 wherein said strengtheningmeans comprise a diagonal member.

5. A single crane girder according to claim 1 wherein said strengtheningmeans comprise a portion of said upper chord.

6. A single crane girder for use with a trolley comprising: a girderhaving an upper and a lower chord and a web; a beam supported by saidgirder and disposed along a portion of the topmost portion thereof, saidbeam comprising a plurality of members disposed above said upper Saddles18 3 4 chord, said members forming at least one substantially ReferencesCited by the Examiner horizontal bearing surface and at least onesubstantially UNITED STATES PATENTS vertical bearing surface, a portionof said web extending 1,383,065 6/1921 Biggert X above said upper chordand connecting said members; 3,194,179 7 19 5 scherer 212.47 X railmeans disposed on said bearing surfaces and on a 5 FOREIGN PATENTS lowerportion of said girder forming means for sustaining 1 344 767 10/1963France pressure from the wheels of a trolley and that the width of1130130 5/1962 Germahy said upper chord exceeds by a substantial amountthe 1:169:096 4/1964 Germany combined width of said beam, saidhorizontal bearing sur- 10 ANDRES H NIELSEN Primary Examiner. face andthe horizontally disposed wheel contacting said EVON C BLUNK, Exa"ninerbeanng surface A. L. LEVINE, Assistant Examiner.

1. A SINGLE CRANE GIRDER FOR USE WITH A TROLLEY COMPRISING: A GRIDERHAVING AN UPPER AND A LOWER CHORD; A BEAM SUPPORTED BY SAID GRIDER ANDDISPOSED ALONG A PORTION OF THE TOPMOST PORTION THEREOF, SAID BEAMCOMPRISING A PLURALITY OF MEMBERS DISPOSED ABOVE SAID UPPER CHORD, SAIDMEMBERS FORMING AT LEAST ONE SUBSTANTIALLY HORIZONTAL BEARING SURFACEAND AT LEAST ONE SUBSTANTIALLY VERTICAL BEARING SURFACE, STRENGTHENINGMEANS DISPOSED ABOVE SAID UPPER CHORD AND CONNECTING SAID MEMBERS; RAILMEANS DISPOSED ON SAID BEARING SURFACES AND ON A LOWER PORTION OF SAIDGIRDER FORMING MEANS FOR SUSTAINING PRESSURE FROM THE WHEELS OF ATROLLEY AND THAT THE WIDTH OF SAID UPPER CHORD EXCEEDS BY A SUBSTANTIALAMOUNT THE COMBINED WIDTH OF SAID BEAM, SAID HORIZONTAL BEARING SURFACEAND THE HORIZONTALLY DISPOSED WHEEL CONTACTING SAID HORIZONTAL BEARINGSURFACE.